include/linux/msi.h

   1 #ifndef LINUX_MSI_H
   2 #define LINUX_MSI_H
   3
   4 #include <linux/kobject.h>
   5 #include <linux/list.h>
   6
   7 struct msi_msg {
   8         u32     address_lo;     /* low 32 bits of msi message address */
   9         u32     address_hi;     /* high 32 bits of msi message address */
  10         u32     data;           /* 16 bits of msi message data */
  11 };
  12
  13 /* Helper functions */
  14 struct irq_data;
  15 struct msi_desc;
  16 extern void mask_msi_irq(struct irq_data *data);
  17 extern void unmask_msi_irq(struct irq_data *data);
  18 extern void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  19 extern void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  20 extern void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  21 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
  22 extern void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
  23 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
  24
  25 struct msi_desc {
  26         struct {
  27                 __u8    is_msix : 1;
  28                 __u8    multiple: 3;    /* log2 number of messages */
  29                 __u8    maskbit : 1;    /* mask-pending bit supported ?   */
  30                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
  31                 __u8    pos;            /* Location of the msi capability */
  32                 __u16   entry_nr;       /* specific enabled entry         */
  33                 unsigned default_irq;   /* default pre-assigned irq       */
  34         } msi_attrib;
  35
  36         u32 masked;                     /* mask bits */
  37         unsigned int irq;
  38         struct list_head list;
  39
  40         union {
  41                 void __iomem *mask_base;
  42                 u8 mask_pos;
  43         };
  44         struct pci_dev *dev;
  45
  46         /* Last set MSI message */
  47         struct msi_msg msg;
  48
  49         struct kobject kobj;
  50 };
  51
  52 /*
  53  * The arch hook for setup up msi irqs
  54  */
  55 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
  56 void arch_teardown_msi_irq(unsigned int irq);
  57 extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
  58 extern void arch_teardown_msi_irqs(struct pci_dev *dev);
  59 extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
  60
  61
  62 #endif /* LINUX_MSI_H */